Definition of accidence noun from the Oxford Advanced Learner's Dictionary

 

accidence

 noun
noun
BrE BrE//ˈæksɪdəns//
 
; NAmE NAmE//ˈæksɪdəns//
 
[uncountable](old-fashioned)
 
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the part of grammar that deals with the inflections of words (= changes in their form according to their function in the sentence) Word Origin early 16th cent.: from late Latin accidentia (translation of Greek parepomena ‘things happening alongside’), neuter plural of the present participle of accidere ‘happen’ from ad- ‘towards, to’ + cadere ‘to fall’.
See the Oxford Advanced American Dictionary entry: accidence